Stethoscope head

ABSTRACT

A detection head of a stethoscope comprises a detection head body ( 1, 2, 8 ) and a sound guiding conduit in the detection head body ( 1, 2 ). The sound guiding conduit comprises a sound collecting surface ( 12, 23 ), a sound guiding pore (D), and a lateral sound guiding aperture ( 4 ). The sound collecting surface ( 12, 23 ), the sound guiding pore (D), and the lateral sound guiding aperture ( 4 ) are disposed on the detection head body ( 1, 2, 8 ), and in combination with each other. At least a part of the detection head body ( 1, 2, 8 ) is made of a second density material. The density of the material of a sound guiding layer ( 3, 5, 6, 7, 9 A) on the sound collecting surface ( 12, 23 ) is greater than that of the second density material.

CROSS-REFERENCES TO RELATED APPLICATIONS

This application is a United States national phase application ofco-pending international patent application number PCT/CN2013/074794,filed Apr. 26, 2013, which claims priority to Chinese patent applicationnumber 201220214856.5, filed May 15, 2012, and Chinese patentapplication number 201210148071.7, filed May 15, 2012, the disclosuresof which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a medical instrument accessory, inparticular to an accessory of a stethoscope, and more particularly to astethoscope head.

TECHNICAL BACKGROUND

High density materials such as copper (with a density of 8.9 g/cm³),titanium alloy (with a density of 7.82 g/cm³), steel or particularlystainless steel (with a density of 7.8 g/cm³), and zinc alloy (with adensity of 6.58 g/cm³) can conduct sounds with a fast speed and lowattenuation, and the conducted sounds can be clearly heard, thus astethoscope head in the prior art is typically made of the high densitymaterials. However, the high density materials are expensive in price,heavy in weight, and monotonous in color, therefore, the stethoscopehead is inconvenient in use.

Further, considering that the stethoscope head is generally made of thehigh density materials such as titanium alloy, copper and stainlesssteel, cutting tools used for machining such stethoscope head have avery high cost and the time taken for the machining is long, thus thestethoscope head is costly, thereby greatly increasing consumer costs.

Furthermore, the stethoscope head in the prior art is formed integrallyand has a shape similar to a waist drum, that is, both ends of thestethoscope head are larger than the middle part of the stethoscopehead, and a mold cannot be stripped in mold casting the stethoscopehead, thus the stethoscope head can only be made by a milling process ata low working efficiency.

SUMMARY OF THE INVENTION

The present invention provides a stethoscope head which is light inweight, low in cost and does not affect the listening experience.

The present invention further provides a method for reducing a weight ofa stethoscope head.

The present invention is realized as below.

A stethoscope head, where the stethoscope head includes a head body anda sound guiding conduit formed in the head body, the sound guidingconduit includes a sound collecting surface, a sound guiding pore and alateral sound guiding aperture, all of which are located on the headbody and intercommunicated with each other, at least a portion of thehead body is made of a second density material, a density of a soundguiding layer on the sound collecting surface is larger than that of thesecond density material.

Further, a density of a sound guiding layer in the sound guiding pore islarger than that of the second density material, also, the density ofthe sound guiding layer in the sound guiding pore is the same as ordifferent from that of a sound guiding layer on the sound collectingsurface.

Furthermore, the head body is separated and includes an upper head bodyand a lower head body which are mutually fitted with each other, thesound collecting surface includes an upper sound collecting surfacedisposed on the upper head body and a lower sound collecting surfacedisposed on the lower head body, the upper sound collecting surface iscommunicated with the lower sound collecting surface through the soundguiding pore, the sound guiding pore is communicated with the lateralsound guiding aperture, the lower head body is made of the same materialas or different material from that of the upper head body, but at leastone of the lower head body and the upper head body is made of the seconddensity material.

If the head body consists of an upper head body and a lower head bodywhich are fitted with each other and a density of the lower head body isdifferent from that of the upper head body, there are three situationsare further illustrated as below.

First, if the upper head body is made of a first density material, thelower head body is made of a second density material, a density of thefirst density material is larger than that of the second densitymaterial.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body andintercommunicated with each other, the head body is separated andincludes an upper head body and a lower head body, which are mutuallyfitted with each other.

The sound collecting surface includes an upper sound collecting surfacedisposed on the upper head body and a lower sound collecting surfacedisposed on the lower head body, the upper sound collecting surface iscommunicated with the lower sound collecting surface through the soundguiding pore, the sound guiding pore intersects with and communicateswith the lateral sound guiding aperture.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit, a tolerancefit or a screw thread fit. A rod chamber of the tubular rivet runsthrough two ends of the tubular rive along an axis of the tubular rivet.A cap portion surface of the tubular rivet is shape-matching with oneend surface of the lower head body. The end of the rod portion of thetubular rivet abuts against the lateral sound guiding aperture.

A profiled tubular rivet is disposed at and is fitted with the other endof the sound guiding pore in the lower head body by an interference fit,a tolerance fit or a screw thread fit. An outside surface of a headportion of the profiled tubular rivet is shape-matching with the lowercollecting surface of the lower head body. A rod chamber of the tubularrivet runs through two ends of the tubular rivet along an axis of thetubular rivet. An end of the rod portion of the profiled tubular rivetabuts against the lateral sound guiding aperture.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body andintercommunicated with each other, the head body is separated andincludes an upper head body and a lower head body, which are mutuallyfitted with each other.

The sound collecting surface includes an upper sound collecting surfacedisposed on the upper head body and a lower sound collecting surfacedisposed on the lower head body, the upper sound collecting surface iscommunicated with the lower sound collecting surface through the soundguiding pore, the sound guiding pore intersects with and communicateswith the lateral sound guiding aperture.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit, a tolerancefit or a screw thread fit. A rod chamber of the tubular rivet runsthrough two ends of the tubular rive along an axis of the tubular rivet.A cap portion surface of the tubular rivet is shape-matching with andclosely fitted with one end surface of the lower head body. A hole isformed in a rod portion of the tubular rivet and runs through the twoside tube walls of the rod portion, an axis of the hole overlaps withthat of the lateral sound guiding aperture, and an aperture of the holeis the same as that of the that of the lateral sound guiding aperture.

A profiled tubular rivet is disposed at and fitted with the other end ofthe sound guiding pore of the lower head body by an interference fit, atolerance fit or a screw thread fit. An outside surface of a headportion of the profiled tubular rivet is shape-matching with the lowersound collecting surface of the lower head body. A rod chamber of theprofiled tubular rivet runs through two ends of the profiled tubularrivet along an axis thereof. An end of the rod portion of the profiledtubular rivet abuts against the tubular rivet.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body andintercommunicated with each other, the head body is separated andincludes an upper head body and a lower head body, which are mutuallyfitted with each other.

The sound collecting surface includes an upper sound collecting surfacedisposed on the upper head body and a lower sound collecting surfacedisposed on the lower head body, the upper sound collecting surface iscommunicated with the lower sound collecting surface through the soundguiding pore, the sound guiding pore intersects with and communicateswith the lateral sound guiding aperture.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit, a tolerancefit or a screw thread fit. A rod chamber of the tubular rivet runsthrough two ends of the tubular rive along an axis of the tubular rivet.A cap portion surface of the tubular rivet is shape-matching with andclosely fitted with one end surface of the lower head body.

A profiled tubular rivet is disposed at and fitted with the other end ofthe sound guiding pore of the lower head body by an interference fit, atolerance fit or a screw thread fit. An outside surface of a headportion of the profiled tubular rivet is shape-matching with the lowersound collecting surface of the lower head body. A rod chamber of theprofiled tubular rivet runs through two ends of the profiled tubularrivet along an axis thereof. A hole is formed in a rod portion of theprofiled tubular rivet and runs through the two side tube walls of therod portion, an axis of the hole overlaps with that of the lateral soundguiding aperture, and an aperture of the hole is the same as that of thethat of the lateral sound guiding aperture. A rod portion of theprofiled tubular rivet abuts against the rod portion of the tubularrivet.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body andintercommunicated with each other, the head body is separated andincludes an upper head body and a lower head body, which are mutuallyfitted with each other.

A hollow tube is disposed in and fitted with the sound guiding pore ofthe lower head body.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit, a tolerancefit or a screw thread fit. A rod chamber of the tubular rivet runsthrough two ends of the tubular rive along an axis thereof. A capportion surface of the tubular rivet is shape-matching with and closelyfitted with one end surface of the lower head body. An end of the rodportion of the tubular rivet abuts against one end of the hollow tube.

A profiled tubular rivet is disposed at and fitted with the other end ofthe sound guiding pore of the lower head body by an interference fit, atolerance fit or a screw thread fit. An outside surface of a headportion of the profiled tubular rivet is shape-matching with the lowersound collecting surface of the lower head body. A rod chamber of theprofiled tubular rivet runs through two ends of the profiled tubularrivet along an axis thereof. An end of the rod portion of the profiledtubular rivet abuts against the other end of the hollow tube.

The lateral sound guiding aperture is communicated with a tube chamberof the hollow tube, a rod chamber of the tubular rivet, a rod chamber ofthe profiled tubular rivet.

Further, a hole is formed in the hollow tube, communicated with the sideguiding hole and runs through at least one side tube wall of the lateralsound guiding aperture.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body andintercommunicated with each other, the head body is separated andincludes an upper head body and a lower head body, which are mutuallyfitted with each other.

A hollow tube is disposed in and fitted with the sound guiding pore ofthe lower head body.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit, a tolerancefit or a screw thread fit. A rod chamber of the tubular rivet runsthrough two ends of the tubular rive along an axis thereof. A capportion surface of the tubular rivet is shape-matching with and closelyfitted with one end surface of the lower head body. An end of the rodportion of the tubular rivet abuts against one end of the hollow tube.

A profiled tubular rivet is disposed at and fitted with the other end ofthe sound guiding pore of the lower head body by an interference fit, atolerance fit or a screw thread fit. An outside surface of a headportion of the profiled tubular rivet is shape-matching with the lowersound collecting surface of the lower head body. A rod chamber of theprofiled tubular rivet runs through two ends of the profiled tubularrivet along an axis thereof. An end of the rod portion of the profiledtubular rivet abuts against the other end of the hollow tube.

The lateral sound guiding aperture is communicated with a tube chamberof the hollow tube, a rod chamber of the tubular rivet, a rod chamber ofthe profiled tubular rivet.

Further, a hole is formed in a rod portion of the semi-tubular, the holecommunicates with the lateral sound guiding aperture and runs through atleast one side tube wall of the lateral sound guiding aperture.

A stethoscope head, where the stethoscope head includes a head body anda sound guiding conduit formed in the head body, the sound guidingconduit includes a sound collecting surface, a sound guiding pore and alateral sound guiding aperture, all of which are located on the headbody, the stethoscope head is separated and includes an upper head bodyand a lower head body which are mutually fitted with each other.

A hollow tube is disposed in and fitted with the sound guiding pore ofthe lower head body.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit, a tolerancefit or a screw thread fit. A rod chamber of the tubular rivet runsthrough two ends of the tubular rive along an axis thereof. A capportion surface of the tubular rivet is shape-matching with and closelyfitted with one end surface of the lower head body. An end of the rodportion of the tubular rivet abuts against one end of the hollow tube.

A profiled tubular rivet is disposed at and fitted with the other end ofthe sound guiding pore of the lower head body by an interference fit, atolerance fit or a screw thread fit. An outside surface of a headportion of the profiled tubular rivet is shape-matching with the lowersound collecting surface of the lower head body. A rod chamber of theprofiled tubular rivet runs through two ends of the profiled tubularrivet along an axis thereof. An end of the rod portion of the profiledtubular rivet abuts against the other end of the hollow tube.

The lateral sound guiding aperture is communicated with a tube chamberof the hollow tube, a rod chamber of the tubular rivet, a rod chamber ofthe profiled tubular rivet.

Further, a hole is formed in the profiled tubular rivet and runs throughat least one side tube wall of the lateral sound guiding aperture, anaxis of the hole overlaps with that of the lateral sound guidingaperture, and an aperture of the hole is the same as that of the that ofthe lateral sound guiding aperture

Second, if the lower head body is made of a first density material, theupper head body is made of a second density material, a density of thefirst density material is larger than that of the second densitymaterial.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body, the head body isseparated and includes an upper head body and a lower head body, whichare mutually fitted with each other.

The sound collecting surface includes an upper sound collecting surfacedisposed on the upper head body and a lower sound collecting surfacedisposed on the lower head body, the upper sound collecting surface iscommunicated with the lower sound collecting surface through the soundguiding pore, the sound guiding pore intersects with and communicateswith the lateral sound guiding aperture.

A profiled tubular rivet is disposed at and fitted with one end of thesound guiding pore of the upper head body by an interference fit, atolerance fit or a screw thread fit. An outside surface of a headportion of the profiled tubular rivet is shape-matching with the uppersound collecting surface of the upper head body. A rod chamber of theprofiled tubular rivet runs through two ends of the profiled tubularrivet along an axis thereof. The other end of the sound guiding pore inthe upper head body is provided with an internal thread which is fittedwith the lower head body. An outside surface of one end of the lowerhead body is provided with an external thread which is fitted with theinternal thread.

Third, if both of the lower head body and the upper head body are madeof the second density material.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body, the head body isseparated and includes an upper head body and a lower head body, whichare mutually fitted with each other.

The sound collecting surface includes an upper sound collecting surfacedisposed on the upper head body and a lower sound collecting surfacedisposed on the lower head body, the upper sound collecting surface iscommunicated with the lower sound collecting surface through the soundguiding pore, the sound guiding pore intersects with and communicateswith the lateral sound guiding aperture.

A first profiled tubular rivet is disposed at and fitted with the oneend of the sound guiding pore of the upper head body by an interferencefit, a tolerance fit or a screw thread fit. An outside surface of a headportion of the first profiled tubular rivet is shape-matching with theupper sound collecting surface of the upper head body. A rod chamber ofthe first profiled tubular rivet runs through two ends of the firstprofiled tubular rivet along an axis thereof. The other end of the soundguiding pore of the upper head body is provided with an internal threadwhich is fitted with the lower head body.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit. A rodchamber of the tubular rivet runs through two ends of the tubular rivealong an axis thereof. A cap portion surface of the tubular rivet isshape-matching with and closely fitted with one end surface of the lowerhead body. An end of the rod portion of the tubular rivet abuts againstthe lateral sound guiding aperture.

A second profiled tubular rivet is disposed at and fitted with the otherend of the sound guiding pore of the lower head body by an interferencefit. An outside surface of a head portion of the second profiled tubularrivet is shape-matching with the lower sound collecting surface. Achamber in the rod portion of the second profiled tubular rivet runsthrough both ends of the second profiled tubular rivet along an axisthereof. An end of the rod portion of the second profiled tubular rivetabuts against the lateral sound guiding aperture.

An outside surface of one end of the lower head body is provided with anexternal thread which is fitted with the internal thread.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body, the head body isseparated and includes an upper head body and a lower head body, whichare mutually fitted with each other.

The sound collecting surface includes an upper sound collecting surfacedisposed on the upper head body and a lower sound collecting surfacedisposed on the lower head body, the upper sound collecting surface iscommunicated with the lower sound collecting surface through the soundguiding pore, the sound guiding pore intersects with and communicateswith the lateral sound guiding aperture.

A first profiled tubular rivet is disposed at and fitted with the oneend of the sound guiding pore of the upper head body by an interferencefit, a tolerance fit or a screw thread fit. An outside surface of a headportion of the first profiled tubular rivet is shape-matching with theupper sound collecting surface of the upper head body. A rod chamber ofthe first profiled tubular rivet runs through two ends of the firstprofiled tubular rivet along an axis thereof. The other end of the soundguiding pore of the upper head body is provided with an internal threadwhich is fitted with the lower head body.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit, a tolerancefit or a screw thread fit, a rod chamber of the tubular rivet runsthrough two ends of the tubular rive along an axis thereof, a capportion surface of the tubular rivet is shape-matching with and closelyfitted with one end surface of the lower head body; a hole is formed inthe rod portion of the tubular rivet, the hole runs through the two sidetube walls of the rod portion, an axis of the hole overlaps with that ofthe lateral sound guiding aperture, and an aperture of the hole is thesame as that of the that of the lateral sound guiding aperture.

A second profiled tubular rivet is disposed at and fitted with the otherend of the sound guiding pore of the lower head body by an interferencefit, an outside surface of a head portion of the second profiled tubularrivet is shape-matching with the lower sound collecting surface, achamber in the rod portion of the second profiled tubular rivet runsthrough both ends of the second profiled tubular rivet along an axisthereof, an end of the rod portion of the second profiled tubular rivetabuts against that of the tubular rivet.

An outside surface of one end of the lower head body is provided with anexternal thread which is fitted with the internal thread.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body, the head body isseparated and includes an upper head body and a lower head body, whichare mutually fitted with each other.

The sound collecting surface includes an upper sound collecting surfacedisposed on the upper head body and a lower sound collecting surfacedisposed on the lower head body, the upper sound collecting surface iscommunicated with the lower sound collecting surface through the soundguiding pore, the sound guiding pore intersects with and communicateswith the lateral sound guiding aperture.

A first profiled tubular rivet is disposed at and fitted with the oneend of the sound guiding pore of the upper head body by an interferencefit, a tolerance fit or a screw thread fit. An outside surface of a headportion of the first profiled tubular rivet is shape-matching with theupper sound collecting surface of the upper head body. A rod chamber ofthe first profiled tubular rivet runs through two ends of the firstprofiled tubular rivet along an axis thereof. The other end of the soundguiding pore of the upper head body is provided with an internal threadwhich is fitted with the lower head body.

A tubular rivet is disposed at and fitted with one end of the soundguiding pore of the lower head body by an interference fit. A rodchamber of the tubular rivet runs through two ends of the tubular rivealong an axis thereof. A cap portion surface of the tubular rivet isshape-matching with and closely fitted with one end surface of the lowerhead body. A second profiled tubular rivet is disposed at and fittedwith the other end of the sound guiding pore of the lower head body byan interference fit. An outside surface of a head portion of the secondprofiled tubular rivet is shape-matching with the lower sound collectingsurface. A chamber in the rod portion of the second profiled tubularrivet runs through both ends of the second profiled tubular rivet alongan axis thereof. A rod portion of the second profiled tubular rivetabuts against that of the lateral sound guiding aperture.

An outside surface of one end of the lower head body is provided with anexternal thread which is fitted with the internal thread.

Where, the sound collecting surface may be a curved surface, a conicalsurface or a combination thereof.

If the head body is integrated:

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body andintercommunicated with each other; the head body is integrated and madeof a second density material, the sound collecting surface may includeonly one sound collecting surface, a sound guiding layer is the same asthe sound collecting surface in shape and includes a hole which runsthrough a bottom thereof and is communicated with the sound guidingpore, the sound guiding layer consists of a profiled tubular rivet, adensity of the profiled tubular rivet is larger than that of the seconddensity material.

Further, an outside surface of the profiled tubular rivet isshape-matching with and closely fitted with the sound collecting surfaceof the head body, an outside surface of a rod portion of the profiledtubular rivet is closely fitted with the sound guiding pore. A rodportion of the profiled tubular rivet is fitted with the sound guidingpore by an interference fit, a tolerance fit or a screw thread fit.

Further, a rod chamber of the profiled tubular rivet is communicatedwith the lateral sound guiding aperture.

Further, the sound collecting surface may include an upper soundcollecting surface and a lower sound collecting surface; the profiledtubular rivet includes a first profiled tubular rivet and a thirdprofiled tubular rivet.

A rod chamber of the first profiled tubular rivet runs through two endsof the first profiled tubular rivet. A rod chamber of the third profiledtubular rivet runs through two ends of the third profiled tubular rivet.

An outside surface of a head portion of the first profiled tubular rivetis shape-matching with and closely fitted with the upper soundcollecting surface, an outside surface of a rod portion of the firstprofiled tubular rivet is closely fitted with the sound guiding pore, arod chamber of the first profiled tubular rivet is communicated with thelateral sound guiding aperture.

An outside surface of a head portion of the third profiled tubular rivetis shape-matching with and closely fitted with the upper soundcollecting surface, an outside surface of a rod portion of the thirdprofiled tubular rivet is closely fitted with the sound guiding pore, arod chamber of the third profiled tubular rivet is communicated with thelateral sound guiding aperture.

Further, the sound collecting surface may include an upper soundcollecting surface and a lower sound collecting surface; the profiledtubular rivet includes a first profiled tubular rivet and a thirdprofiled tubular rivet.

A rod chamber of the first profiled tubular rivet runs through two endsof the first profiled tubular rivet. A rod chamber of the third profiledtubular rivet runs through two ends of the third profiled tubular rivet.

An outside surface of a head portion of the first profiled tubular rivetis shape-matching with and closely fitted with the upper soundcollecting surface, an outside surface of a rod portion of the firstprofiled tubular rivet is closely fitted with the sound guiding pore. Arod portion of the first profiled tubular rivet is fitted with the soundguiding pore by an interference fit, a tolerance fit or a screw threadfit. A rod chamber of the first profiled tubular rivet is communicatedwith the lateral sound guiding aperture.

An outside surface of a head portion of the third profiled tubular rivetis shape-matching with and closely fitted with the upper soundcollecting surface, an outside surface of a rod portion of the thirdprofiled tubular rivet is closely fitted with the sound guiding pore. Arod portion of the profiled tubular rivet is fitted with the soundguiding pore by an interference fit, a tolerance fit or a screw threadfit. A rod portion of the third profiled tubular rivet is fitted withthe sound guiding pore by an interference fit, a tolerance fit or ascrew thread fit, a rod chamber of the third profiled tubular rivet iscommunicated with the lateral sound guiding aperture. An end of the rodportion of the first profiled tubular rivet abuts against the thirdprofiled tubular rivet.

A hole is formed in the rod portion of the first profiled tubular rivetor the third profiled tubular rivet, the hole is communicated with arotation shaft and the rod chamber and runs through at least one siderod wall of the rod portion.

Further, the sound collecting surface may include an upper soundcollecting surface and a lower sound collecting surface; the profiledtubular rivet includes a first profiled tubular rivet and a thirdprofiled tubular rivet.

A rod chamber of the first profiled tubular rivet runs through two endsof the first profiled tubular rivet. A rod chamber of the third profiledtubular rivet runs through two ends of the third profiled tubular rivet.

An outside surface of a head portion of the first profiled tubular rivetis shape-matching with and closely fitted with the upper soundcollecting surface, an outside surface of a rod portion of the firstprofiled tubular rivet is closely fitted with the sound guiding pore, arod chamber of the first profiled tubular rivet is communicated with thelateral sound guiding aperture.

An outside surface of a head portion of the third profiled tubular rivetis shape-matching with and closely fitted with the upper soundcollecting surface, an outside surface of a rod portion of the thirdprofiled tubular rivet is closely fitted with the sound guiding pore, arod chamber of the third profiled tubular rivet is communicated with thelateral sound guiding aperture.

A sound guiding layer on an inner wall of the sound guiding pore is ahollow tube. An outer wall of the hollow tube is closely fitted with theinner wall of the sound guiding pore. The hollow tube is fitted with thesound guiding pore by an interference fit, a tolerance fit or a screwthread fit. Two ends of the hollow tube abuts against an end of the rodportion of the first profiled tubular rivet and an end of the rodportion of the third profiled tubular rivet respectively.

A hole is formed in the hollow tube, the hole is communicated with thelateral sound guiding aperture and the rod chamber and runs through atleast one side rod wall of the rod portion.

A stethoscope head includes a head body and a sound guiding conduitformed in the head body, the sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body; the head body isintegrated and made of a second density material, the sound guidinglayer is composed of a profiled tubular rivet, a density of the profiledtubular rivet is larger than that of the second density material.

Further, an outside surface of a head portion of the profiled tubularrivet is shape-matching with and closely fitted with the soundcollecting surface of the head body, a rod portion of the profiledtubular rivet is fitted with the sound guiding pore by an interferencefit, a tolerance fit or a screw thread fit, an outside surface of a rodportion of the profiled tubular rivet is closely fitted with the soundguiding pore.

Further, a rod chamber of the profiled tubular rivet is communicatedwith the lateral sound guiding aperture.

Further, a sound guiding layer on an inner wall of the sound guidingpore may be a hollow tube. An outer wall of the hollow tube is fittedwith the inner wall of the sound guiding pore in a non-ratable andimmovable manner. Two ends of the hollow tube abut against rod ends ofthe profiled tubular rivet. A hole is formed in the hollow tube, an axisof the hole overlaps with that of the lateral sound guiding aperture, anaperture of the hole is the same as that of the that of the lateralsound guiding aperture, the hole runs through at least one side rod wallof the rod portion and is communicated with the rod chamber.

The present disclosure can be implemented in the following ways.

A method for reducing a weight of a stethoscope head, where thestethoscope head includes a head body and a sound guiding conduit formedin the head body, the which sound guiding conduit includes a soundcollecting surface, a sound guiding pore and a lateral sound guidingaperture, all of which are located on the head body, a first densitymaterial is provided, at least the sound guiding layer on the soundcollecting surface is made of the first density material so as to ensurea sound conducting quality of the stethoscope head; a second densitymaterial is provided, at least a portion of the stethoscope head is madeof the second density material, a density of the second density materialis less than that of the first density material.

Further, a sound guiding layer in the sound guiding pore is made of athird density material, the density of the second density material isless than that of the third density material, a density of the thirddensity material is the same as or different from that of the firstdensity material.

The densities of the various materials are as follows: such as copper(with a density of 8.9 g/cm³), titanium alloy (with a density of 7.82g/cm³), stainless steel, steel (with a density of 7.8 g/cm³), zinc alloy(with a density of 6.58 g/cm³) or aluminium alloy (with a density of 2.7g/cm³), engineering plastics (with a density of in a range of 0.8 g/cm³to 2 g/cm³) and engineering rubber (with a density of in a range of 0.4g/cm³ to 1.5 g/cm³)

The present disclosure possesses the following benefits.

First, the head body is made of a low density material, thereby reducinga weight of the head body per se, second, the sound is reflected by thesound guiding layer during conducting of the sound and the sound guidinglayer is made of a higher density material, therefore the conduction andmagnification of the sound are improved, the hearing effect does notbeen affected, the present further possesses the following benefits.

First, a consumption of the high density material is reduced by 50%, thecost of the material is significantly reduced.

Second, a machining of the high density material is reduced by 40%,thereby reducing consumed cutting tools and machining time required formachining the high density material, the cost for machining issignificantly reduced, for example, a machining manner in which the highdensity material is enclosed by the low density material by an injectionis high in efficiency and low in cost.

Third, a weight of the head body is reduced to 60%, thereby the productis portable.

Fourth, a color of the stethoscope head are enriched, thereby providingvarious color match, for example, the two different densities materialsmay select from different colors.

The upper head body and lower head body are formed by casting becausethe head body is separated, thereby greatly reducing the processingdifficulty for vehicle processing in the prior art and a cost forworking.

DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram the present disclosure (with one soundcollecting surface);

FIG. 2 is a schematic diagram showing an assembly of the presentdisclosure (where only a lower head body is made of a low-densitymaterial);

FIG. 3 is a schematic diagram showing the present disclosure (where onlya lower head body is made of a low-density material);

FIG. 4 is a schematic diagram showing an upper head body of the presentdisclosure;

FIG. 5 is a schematic diagram showing a tubular rivet of the presentdisclosure;

FIG. 6 is a schematic diagram showing a profiled tubular rivet of thepresent disclosure;

FIG. 7 is a schematic diagram showing a lower head body of the presentdisclosure;

FIG. 8 is a schematic diagram showing an assembly of the presentdisclosure (where only an upper head body is made of a low-densitymaterial);

FIG. 9 is a schematic diagram showing an assembly of the presentdisclosure (where only an upper head body is made of a low-densitymaterial);

FIG. 10 is a schematic diagram showing a profiled tubular rivet of thepresent disclosure;

FIG. 11 is a schematic diagram showing an assembly of the presentdisclosure (where both of an upper head body and a lower head are madeof low-density material);

FIG. 12 is a schematic diagram of the present disclosure (where both ofan upper head body and a lower head are made of low-density material);

FIG. 13 is a schematic diagram of the present disclosure (where a headbody is integrated).

FIG. 14 is a schematic diagram of the present disclosure (where a headbody is integrated).

FIG. 15 is a schematic diagram of the present disclosure (where a headbody is integrated).

FIG. 16 is a schematic diagram of the present disclosure (where a headbody is integrated).

FIG. 17 is a schematic diagram of the present disclosure (where a headbody is integrated).

FIG. 18 is a schematic diagram showing a hollow tube of the presentdisclosure.

Where in the drawings:

-   1: upper head body; 11: internal thread; 12: upper sound collecting    surface; 2: lower head body; 21: end surface; 22: external thread;    23: lower sound collecting surface; 3: tubular rivet; 31: chamber in    a rod portion; 32: cap portion of the tubular rivet; 33: end of the    rod portion of the tubular rivet; 34: hole; 35: rod portion; 4:    lateral sound guiding aperture; D: sound guiding pore; 5: first    profiled tubular rivet; 51: outside surface of a head portion; 52:    chamber in a rod portion; 53: end of the rod portion; 54: hole; 55:    rod portion; 5A: profiled tubular rivet; 51A: outside surface of a    head portion; 52A: chamber in a rod portion; 53A: end of a rod    portion of a first profiled tubular rivet; 54A: hole; 55A: rod    portion; 57A: nailhead; 6: second profiled tubular rivet 61: outside    surface of a head portion; 62: chamber in the rod portion; 63: rod    portion; 7: third profiled tubular rivet; 71: outside surface of a    head portion; 72: chamber in the rod portion; 73: rod portion; 74:    end of the rod portion; 8: head body; 9: hollow tube; 91: tube    chamber; 92: inner wall 93: hole; 93A: hollow tube; 92A: inner wall;    93A: hole.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In order to illustrate the present disclosure and the beneficial effectsthereof in detail, the present disclosure will be further illustratedbelow with reference to the accompanying drawings, and the protectionscope of the present disclosure is not limited to the contents of thespecific embodiments.

The present disclosure is further illustrated with reference to thedrawings.

In a first embodiment, the present disclosure is further illustratedbelow with reference to FIG. 1.

A stethoscope head includes a head body and a sound guiding conduit inthe head body. The sound guiding conduit includes a lower soundcollecting surface 23, a sound guiding pore D and a lateral soundguiding aperture 4. The lower sound collecting surface 23, the soundguiding pore D and the lateral sound guiding aperture 4 are provided ina lower head body 2.

In the present embodiment, there exists only one sound collectingsurface, i.e. the lower sound collecting surface 23 in the presentembodiment. A sound guiding layer is closely fitted on the lower soundcollecting surface 23. The sound guiding layer may be a first profiledtubular rivet 5, an outside surface 51 of a head portion of the firstprofiled tubular rivet 5 fits the lower sound collecting surface 23 andclosely matches with the lower sound collecting surface 23, and an outersurface of a rod portion 55 of the first profiled tubular rivet 5closely matches with the sound guiding pore D.

A chamber 52 in the rod portion of the first profiled tubular rivet 5runs through both ends of the first profiled tubular rivet 5. Thechamber 52 is communicated with the lateral sound guiding aperture 4.

The rod portion 55 of the first profiled tubular rivet 5 includes a hole54 which opens at a side wall of the rod portion 55 and is communicatedwith the chamber 52. The hole 54 is communicated with the lateral soundguiding aperture 4.

During machining, the lower head body 2 is formed by casing,subsequently the sound guiding pore D and the lateral sound guidingaperture 4 are formed in the lower head body 2, and then the rod portion55 of the first profiled tubular rivet 5 is disposed in the soundguiding pore D.

Alternatively, the first profiled tubular rivet 5 is prepared, then therod portion 55 and the outer end surface 51 of the first profiledtubular rivet 5 are covered by the lower head body 2 in a non-rotatableand immovable manner by injection moulding, thereby forming anintegrated structure where the first profiled tubular rivet 5 is closelyfitted with the lower head body 2.

In a second embodiment, the present disclosure is further illustratedwith reference to FIG. 17 and FIG. 18.

A stethoscope head includes a head body and a sound guiding conduit inthe head body. The sound guiding conduit includes a lower soundcollecting surface 23, a sound guiding pore D and a lateral soundguiding aperture 4. The lower sound collecting surface 23, the soundguiding pore D and the lateral sound guiding aperture 4 are provided ina lower head body 2.

A sound guiding layer is closely fitted on the lower sound collectingsurface 23. The sound guiding layer may be a first profiled tubularrivet 5, an outside surface 51 of a head portion of the first profiledtubular rivet 5 fits the lower sound collecting surface 23 and closelymatches with the lower sound collecting surface 23, and an outer surfaceof a rod portion 55 of the first profiled tubular rivet 5 closelymatches with the sound guiding pore D.

A chamber 52 in the rod portion of the first profiled tubular rivet 5runs through both ends of the first profiled tubular rivet 5. Thechamber 52 is communicated with the lateral sound guiding aperture 4.

Further, a sound guiding layer made of aluminium alloy, which may be ahollow tube 9A with one blind end, is disposed on an inner wall of thesound guiding pore D. An outer wall of the hollow tube is closely fittedwith an inner wall of the sound guiding pore D by means of tolerancefit, thread fit and so on.

An end 53 of the rod portion of the first profiled tubular rivet 5 isadjacent to but not in contact with an open end of the hollow tube 9A,alternatively, the end 53 of the rod portion of the first profiledtubular rivet 5 abuts against the open end of the hollow tube 9A.

The first profiled tubular rivet 5 and the hollow tube 9A may be made ofsteel especially stainless steel, copper, aluminium alloy or the like,and the lower head body 2 may be made of engineering plastics,engineering rubber or the like.

In a third embodiment, the present disclosure is further illustratedwith reference to FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6 and FIG. 7.

A stethoscope head consists of individual upper head body 1 and lowerhead body 2, an upper sound collecting surface 12 located on the upperhead body 1, a lower sound collecting surface 23 which is located on thelower head body 2 and is opposite to the upper sound collecting surface12, a lateral sound guiding aperture 4 in the lower head body 2, atubular rivet 3 and a first profiled tubular rivet 5.

The upper head body 1 is provided with an internal thread 11, and thelower head body 2 is provided with an external thread 22, so that theupper head body 1 and the lower head body 2 are fixed together throughthe cooperation between the internal thread 11 and the external thread22.

A sound guiding pore D runs through the upper head body 1 and the lowerhead body 2, so that the upper sound collecting surface 12 iscommunicated with the lower sound collecting surface 23 through thesound guiding pore D. The sound guiding pore D is communicated with andintersects with the lateral sound guiding aperture 4. The upper headbody 1 is made of stainless steel, and the lower head body 2 is made ofengineering plastics. The tubular rivet 3 is disposed at one end of thesound guiding pore D in the lower head body 2 by an interference fit. Arod chamber 31 (i.e. a chamber in a rod portion) of the tubular rivet 3runs through two ends of the tubular rivet 3 along an axis of thetubular rivet 3. A cap portion 32 of the tubular rivet 3 is closelyshape-fitted with an end surface 21 of the lower head body 2. A rodportion of the tubular rivet 3 is closely fitted with the sound guidingpore D. An end 33 of the rod portion of the tubular rivet 3 abutsagainst the lateral sound guiding aperture 4. The first profiled tubularrivet 5 is disposed at the other end of the sound guiding pore D in thelower head body 2 in interference fit. An outside surface 51 of a headportion of the first profiled tubular rivet 5 is matching with the lowersound collecting surface 23 of the lower head body 2. A rod potion ofthe tubular rivet 5 is closely fitted with the sound guiding pore D. Arod chamber 52 of the first profiled tubular rivet 5 runs through twoends of the first profiled tubular rivet 5 along an axis thereof. An end53 of the rod portion of the first profiled tubular rivet 5 abutsagainst the lateral sound guiding aperture 4.

In a fourth embodiment, the present disclosure is further illustratedwith reference to FIG. 8, FIG. 9 and FIG. 10.

A stethoscope head consists of an upper head body 1, a lower head body2, an upper sound collecting surface 12 which is curved and located onthe upper head body 1, a lower sound collecting surface 23 which islocated on the lower head body 2 and is opposite to the upper soundcollecting surface 12, a lateral sound guiding aperture 4 disposed inthe lower head body 2 and a second profiled tubular rivet 6.

The upper head body 1 is provided with an internal thread 11, and thelower head body 2 is provided with an external thread 22, so that theupper head body 1 and the lower head body 2 are fixed together throughthe cooperation between the internal thread 11 and the external thread22.

A sound guiding pore D runs through the upper head body 1 and the lowerhead body 2, so that the upper sound collecting surface 12 iscommunicated with the lower sound collecting surface 23 through thesound guiding pore D. The sound guiding pore D is communicated with andintersects with the lateral sound guiding aperture 4.

The upper head body 1 is made of engineering rubber, and the lower headbody 2 is made of zinc alloy material.

A second profiled tubular rivet 6 is disposed at one end of the soundguiding pore D in the upper head body 1 by an interference fit. Anoutside surface 61 of a head portion of the second profiled tubularrivet 6 is shape-matching with the upper sound collecting surface 12 ofthe upper head body 1. A chamber 62 in a rod portion 63 of the secondprofiled tubular rivet 6 runs through both ends of the second profiledtubular rivet 6. The rod portion 63 is disposed in the sound guidingpore D, where an outside surface of the rod portion 63 is closely fittedwith an inner wall of the sound guiding pore D. Another end of the soundguiding pore D in the upper head body 1 is provided with the internalthread 11 which is fitted with the lower head body 2.

In a fifth embodiment, the present disclosure is further illustratedwith reference to FIG. 4, FIG. 5, FIG. 6, FIG. 7, FIG. 10, FIG. 11 andFIG. 12.

A stethoscope head consists of an upper head body 1, a lower head body2, an upper sound collecting surface 12 which located on the upper headbody 1, a lower sound collecting surface 23 which is located on thelower head body 2 and is opposite to the upper sound collecting surface12, a lateral sound guiding aperture 4 and a sound guiding pore D whichare disposed in the lower head body 2, a tubular rivet 3 and a firstprofiled tubular rivet 5.

The upper head body 1 is provided with an internal thread 11, and thelower head body 2 is provided with an external thread 22, so that theupper head body 1 and the lower head body 2 are fixed together throughthe cooperation between the internal thread 11 and the external thread22.

The sound guiding pore D runs through the upper head body 1 and thelower head body 2, so that the upper sound collecting surface 12 iscommunicated with the lower sound collecting surface 23 through thesound guiding pore D. The sound guiding pore D is communicated with andintersects with the lateral sound guiding aperture 4.

In the case that both of the upper head body 1 and the lower head body 2are made of engineering plastics or engineering rubber, the tubularrivet 3 and the first profiled tubular rivet 5 may be made of materialsuch as copper (with a density of 8.9 g/cm³), titanium alloy (with adensity of 7.82 g/cm³), stainless steel, steel (with a density of 7.8g/cm³), zinc alloy (with a density of 6.58 g/cm³) or aluminium alloy(with a density of 2.7 g/cm³), which has a density larger than that ofengineering plastics or engineering rubber.

In the case that both of the upper head body 1 and the lower head body 2are made of the aluminium alloy, the tubular rivet 3 and the firstprofiled tubular rivet 5 may be made of material such as copper (with adensity of 8.9 g/cm³), titanium alloy (with a density of 7.82 g/cm³),steel (with a density of 7.8 g/cm³), and zinc alloy (with a density of6.58 g/cm³), which has a density larger than that of the aluminiumalloy.

The second profiled tubular rivet 6 is disposed at one end of the soundguiding pore D in the upper head body 1 by an interference fit. Anoutside surface 61 of a head portion of the second profiled tubularrivet 6 is matching with the upper sound collecting surface 12 on theupper head body 1. A chamber 62 in the rod portion of the secondprofiled tubular rivet 6 runs through both ends of the second profiledtubular rivet 6. The other end of the sound guiding pore D in the upperhead body 1 is provided with the internal thread 11 which matches withthe lower head body 2.

The tubular rivet 3 is disposed at one end of the sound guiding pore Din the lower head body 2 by an interference fit. A rod chamber 31 of thetubular rivet 3 runs through two ends of the tubular rivet 3 along anaxis of the tubular rivet 3. A cap portion 32 of the tubular rivet 3 isclosely fitted with an end surface 21 of the lower head body 2 and isshape-matching with the end surface 21 of the lower head body 2. A rodportion 33 of the tubular rivet abuts against the lateral sound guidingaperture 4. The first profiled tubular rivet 5 is disposed at the otherend of the sound guiding pore D in the lower head body 2 by aninterference fit. An outside surface 51 of a head portion of the firstprofiled tubular rivet 5 is shape-matching with the lower soundcollecting surface 23 of the lower head body 2, and a rod chamber 52 ofthe first profiled tubular rivet 5 runs through two ends of the firstprofiled tubular rivet 5 along an axis thereof. An end 53 of the rodportion of the first profiled tubular rivet 5 abuts against the lateralsound guiding aperture 4.

In a sixth embodiment, the present disclosure is further illustratedwith reference to FIG. 13, FIG. 14, FIG. 15 and FIG. 16.

A stethoscope head includes a head body 8 and a sound guiding conduitformed in the head body. The sound guiding conduit includes a soundcollecting surface, a sound guiding pore D and a lateral sound guidingaperture 4. The sound collecting surface includes an upper soundcollecting surface 12 and a lower sound collecting surface 23.

The head body 8 is integral and made of engineering rubber.

A sound guiding layer on the upper sound collecting surface 12 iscomposed of a first profiled tubular rivet 5 made of copper. A soundguiding layer on the lower sound collecting surface 23 is composed of athird profiled tubular rivet 7 made of titanium alloy.

Further, an outside surface 51 of a head portion of the first profiledtubular rivet 5 is shape-matching with and closely fitted with the uppersound collecting surface 12 of the head body 8. An outside surface of arod portion of the first profiled tubular rivet 5 is closely fitted withthe sound guiding pore D.

An outside surface 71 of a head portion of the third profiled tubularrivet 7 is shape-matching with and closely fitted with the lower soundcollecting surface 23 of the head body 8. An outside surface of a rodportion 73 of the third profiled tubular rivet 7 is closely fitted withthe sound guiding pore D.

Further, a rod chamber 52 of the first profiled tubular rivet 5 runsthrough two ends of the first profiled tubular rivet 5 and iscommunicated with the lateral sound guiding aperture 4. A rod chamber 72of the third profiled tubular rivet 7 runs through two ends of the thirdprofiled tubular rivet 7 and is communicated with the lateral soundguiding aperture 4.

Referring to FIG. 13 and FIG. 14, an end of the rod portion of the firstprofiled tubular rivet 5 abuts against and is communicated with thelateral sound guiding aperture 4. An end of the rod portion of the thirdprofiled tubular rivet 7 abuts against and is communicated with thelateral sound guiding aperture 4.

Further referring to FIG. 15, a through hole, which is coaxial with thelateral sound guiding aperture 4 and has a bore diameter same as that ofthe lateral sound guiding aperture 4, is formed in the rod portion 73 ofthe third profiled tubular rivet 7 and opens on the wall of the rodportion 73, and is communicated with the rod chamber. An end of the rodportion of the first profiled tubular rivet 5 abuts against that of thethird profiled tubular rivet 7.

Alternatively, referring to FIG. 16, a through hole, which is coaxialwith the lateral sound guiding aperture 4 and has a bore diameter sameas that of the lateral sound guiding aperture 4, is formed in the rodportion 55 of the first profiled tubular rivet 5 and opens on the wallof the rod portion 55, and is communicated with the rod chamber 52. Anend of the rod portion of the third profiled tubular rivet 7 abutsagainst that of the first profiled tubular rivet 5.

In a seventh embodiment, the present disclosure is further illustratedwith reference to FIG. 13, FIG. 14, FIG. 15 and FIG. 16.

The present embodiment of the present invention provides a method formanufacturing a stethoscope head with a reduced weight, and thestethoscope head includes a head body 8 and a sound guiding conduitformed in the head body. The sound guiding conduit includes an uppersound collecting surface 12, a lower sound collecting surface 23, asound guiding pore D and a lateral sound guiding aperture 4.

A first profiled tubular rivet 5 and a third profiled tubular rivet 7are made of stainless steel.

The head body 8, which may be assembled or integral, may be made ofengineering plastics.

An outside surface 51 of a head portion of the first profiled tubularrivet 5 is shape-matching with and closely fitted with the upper soundcollecting surface 12 of the head body 8. An outside surface of a rodportion 55 of the first profiled tubular rivet 5 is closely fitted withthe sound guiding pore D.

An outer surface 71 of a head portion of the third profiled tubularrivet 7 is shape-matching with and closely fitted with the lower soundcollecting surface 23 of the head body 8. An outside surface of a rodportion of the third profiled tubular rivet 7 is closely fitted with thesound guiding pore D.

In an eighth embodiment, the present disclosure is further illustratedwith reference to FIG. 9.

The present embodiment of the present invention provides a method formanufacturing a stethoscope head with a reduced weight, and thestethoscope head includes an upper head body 1, a lower head body 2 anda second profiled tubular rivet 6.

The upper head body 1 is provided with a curved upper sound collectingsurface 12, and the lower head body 2 is provided with a lower soundcollecting surface 23 and a lateral sound guiding aperture 4, where theupper head body 1 is provided with an internal thread 11, and the lowerhead body 2 is provided with an external thread 22, so that the upperhead body 1 and the lower head body 2 are fixed together through a fitof the internal thread 11 and the external thread 22.

A sound guiding pore D runs through the upper head body 1 and the lowerhead body 2, so that the upper sound collecting surface 12 iscommunicated with the lower sound collecting surface 23 through thesound guiding pore D. The sound guiding pore D is communicated with andintersects the lateral sound guiding aperture 4.

The upper head body 1 is made of engineering rubber.

The lower head body 2 is made of stainless steel.

The second profiled tubular rivet 6 is made of aluminium alloy.

A second profiled tubular rivet 6 is disposed at one end of the soundguiding pore D in the upper head body 1 by an interference fit. Anoutside surface 61 of a head portion of the second profiled tubularrivet 6 is shape-matching with the upper sound collecting surface 12, achamber 62 in the rod portion of the second profiled tubular rivet 6runs through both ends of the second profiled tubular rivet 6, and theother end of the sound guiding pore D in the upper head body 1 isprovided with the internal thread 11 fitted with the lower head body 2.

Compared with the prior art, the present disclosure has benefits furtherillustrated below.

For example, an exemplary stethoscope in the prior art is manufacturedby Wuxi Kaishun Medical Device Manufacturing CO., Ltd.

In the detection below, a sound collecting chamber refers to a chamberformed by fixing a diaphragm over the sound collecting surface of thehead body.

A method for testing a sound conducting performance of the stethoscopeincludes steps as below.

First, the sound collecting chamber of the stethoscope head is placed ona sealing connector of a sound generator such that the sound collectingsurface (i.e. the diaphragm) of the stethoscope head rightly faces asound output port of the sound generator, and a joint between an outwardface of the sound collecting surface and an inward face of the soundoutput port of the sound generator is in sealed status. A distancebetween the sound output port of the sound generator and the soundcollecting surface of the stethoscope head is in a range from 8 mm to 10mm.

Secondly, one end of a sound conducting tube with a diameter of 10 mm, abore diameter of 4 mm and a length of 40 cm is connected to a soundconducting connector of the stethoscope head, and the other end of thesound conducting tube is connected to an audio receiver.

Thirdly, the sound generator and the audio receiver are turned on, anumerical value detected by the audio receiver is recorded and isdivided by a standard numerical value of the sound generator to obtain aquotient, which is used for obtaining the sound conducting performanceof the stethoscope.

A method for testing external noise resistance of the stethoscopeincludes steps as below.

First, a back surface of the sound collecting chamber of the stethoscopehead is placed on the sealing connector of the sound generator such thatthe back surface of the sound collecting surface of the stethoscope headrightly faces the sound output port of the sound generator, and a jointbetween an outward face of the sound collecting surface and an inwardface of the sound output port of the sound generator is in sealedstatus. The distance between the sound output port of the soundgenerator and the sound collecting surface of the stethoscope head is ina range from 4 mm to 6 mm.

Secondly, one end of the sound conducting tube with a diameter of 10 mm,an aperture of 4 mm and a length of 40 cm is connected to a soundconducting connector of the stethoscope head, and the other end of thesound conducting tube is connected to an audio receiver.

Thirdly, the sound generator and the audio receiver are turned on, anumerical value detected by the audio receiver is recorded and isdivided by a standard numerical value of the sound generator to obtain aquotient, which is used for obtaining the external noise resistance ofthe stethoscope.

Comparing Example 1

from comparison of the stethoscope of the first embodiment of thepresent invention with stethoscopes of KS-410A, KS-410B and KS-410Ctypes manufactured by Wuxi Kaishun Medical Device Manufacturing CO.,Ltd, it can be known that time for manufacturing the inventivestethoscope is saved by about a quarter, a cost for manufacturing theinventive stethoscope is saved by more than one third, the externalnoise resistance of the inventive stethoscope is improved by about onefifth, and a weight of the inventive stethoscope is reduced by about onethird, without significant change to the sound conducting performance,further, the inventive stethoscope is easy to carry and has a goodappearance.

Comparative data of a stethoscope of the first embodiment of the presentdisclosure with the KS-410A type of stethoscope are shown below.

Type of stethoscope Data with single sound comparison collecting surfaceThe inventive stethoscope KS-410A result Structure Individually made ofa Made of only high density combination of high density materialmaterial and low density material Name of high Stainless steel (type304) Stainless steel (type 304) density material Material 30 grams × CNY0.035 85 grams × CNY 0.035 consumption and per gram = CNY 1.05 per gram= CNY 2.97 cost Name of low-density Polyformaldehyde (POM) materialMaterial 14 grams × CNY 0.025 consumption and per gram = CNY 0.35 costCutting tool CNY 1.85 CNY 2.23 consumption Machining time and 258 sec ×CNY 0.011 341 sec × CNY 0.011 Machining cost per second = CNY 2.86 persecond = CNY 3.75 time is saved by 24% Total cost CNY 6.11 CNY 8.95Total cost is save by 32% Sound conducting Sound source: 114 dB Soundsource: 114 dB Sound performance test 1000 HZ 1000 HZ conducting (wherea sound is Measured value: 109 dB Measured value: 109.6 dB performancecollected by a sound Sound source: 114 dB Sound source: 114 dB has nocollecting chamber 500 HZ 500 HZ significant of the stethoscope)Measured value: 102 dB Measured value: 101 dB change External noiseSound source: 114 dB Sound source: 114 dB External resistance 1000 HZ1000 HZ noise performance test Measured value: 35 dB Measured value:42.6 dB resistance is (where a sound is Sound source: 114 dB Soundsource: 114 dB improved by collected by a back 500 HZ 500 HZ 18% to 21%of the stethoscope) Measured value: 28 dB Measured value: 35.3 dBAesthetics (two With two colors mixed Monochrome Visual effect colorsmixed) is improved Portability 44 grams 85 grams Easy to carry (inweight)

Comparative data of a stethoscope of the first embodiment of the presentdisclosure with the KS-410B type of stethoscope are shown below.

Type of stethoscope Data with single sound comparison collecting surfaceThe inventive stethoscope KS-410B result Structure Individually made ofa Made of only high density combination of high density materialmaterial and low density material Name of high Stainless steel (type304) Stainless steel(type 304) density material Material 35 grams × CNY0.035 95 grams × CNY 0.035 consumption and per gram = CNY 1.22 per gram= CNY 3.32 cost Name of low-density Polyformaldehyde (POM) materialMaterial 17 grams × CNY 0.025 consumption and per gram = CNY 0.42 costCutting tool CNY 1.65 CNY 2.11 consumption Machining time and 276 second× CNY 0.011 375 second × CNY 0.011 Machining cost per second = CNY 3.03per second = CNY 4.12 time is saved by 26% Total cost CNY 6.32 CNY 9.55Total cost is save by 34% Sound conducting Sound source: 114 dB Soundsource: 114 dB Sound performance test 1000 HZ 1000 HZ conducting (wherea sound is Measured value: 110 dB Measured value: 109.5 dB performancecollected by a sound Sound source: 114 dB 500 HZ Sound source: 114 dB500 HZ has no collecting chamber Measured value: 101 dB Measured value:102.3 dB significant of the stethoscope) change External noise Soundsource: 114 dB Sound source: 114 dB External resistance 1000 HZ 1000 HZnoise performance test Measured value: 34 dB Measured value: 43 dBresistance is (where a sound is Sound source 114 dB 500 HZ Sound source114 dB 500 HZ improved by collected by a back Measured value: 26.4 dBMeasured value: 36.1 dB 21% to 27% of the stethoscope) Aesthetics (twoWith two colors mixed Monochrome Visual effect colors mixed) is improvedPortability 52 grams 95 grams Easy to carry (in weight)

Comparative data of a stethoscope of the first embodiment of the presentdisclosure with the KS-410C type of stethoscope are shown below.

Type of stethoscope Data with single sound comparison collecting surfaceThe inventive stethoscope KS-410C result Structure Individually made ofa Made of only high density combination of high density materialmaterial and low density material Name of high Stainless steel (type304) Stainless steel(type 304) density material Material 33 grams × CNY0.035 87 grams × CNY 0.035 consumption and per gram = CNY 1.155 per gram= CNY 3.045 cost Name of Polyformaldehyde (POM) low-density materialMaterial 18 grams × CNY 0.025 consumption and per gram = CNY 0.45 costCutting tool CNY 1.75 CNY 2.08 consumption Machining time 278 second ×CNY 0.011 374 second × CNY 0.011 Machining and cost second = CNY 3.05per second = CNY 4.11 time is saved by 26% Total cost CNY 6.41 CNY 9.23Total cost is save by 31% Sound conducting Sound source: 114 dB Soundsource: 114 dB Sound performance test 1000 HZ 1000 HZ conducting (wherea sound is Measured value: 107 dB Measured value: 108 dB performancecollected by a Sound source: 114 dB 500 HZ Sound source: 114 dB 500 HZhas no sound collecting Measured value: 101.2 dB Measured value: 102 dBsignificant chamber of the change stethoscope) External noise Soundsource: 114 dB Sound source: 114 dB External resistance 1000 HZ 1000 HZnoise performance test Measured value: 38 dB Measured value: 43.5 dBresistance is (where a sound is Sound source: 114 dB 500 HZ Soundsource: 114 dB 500 HZ improved by collected by a back Measured value:27.3 dB Measured value: 36.1 dB 13% to 25% of the stethoscope)Aesthetics (two With two colors mixed Monochrome Visual effect colorsmixed) is improved Portability 50 grams 90 grams Easy to carry (inweight)

Comparing Example 2

from comparison of the stethoscope of the second embodiment of thepresent invention with stethoscopes of KS-450A, KS-450B and KS-450Ctypes manufactured by Wuxi Kaishun Medical Device Manufacturing CO.,Ltd, it can be known that time for manufacturing the inventivestethoscope is saved by about a quarter, a cost for manufacturing theinventive stethoscope is reduced by about one third, the external noiseresistance of the inventive stethoscope is improved by about one fifth,a weight of the inventive stethoscope is reduced by about one third,without significant change to the sound conducting performance, furtherthe inventive stethoscope is easy to carry and has a good appearance.

Comparative data of a stethoscope of the second embodiment of thepresent disclosure with the KS-450A type of stethoscope are shown below.

Type of stethoscope Data with single sound comparison collecting surfaceThe inventive stethoscope KS-450A result Structure Integratedcombination of Made of only high density high density material andmaterial low density material formed by injection molding Name of highStainless steel (type 304) Stainless steel(type 304) density materialMaterial 32 grams × CNY 0.035 87 grams × CNY 0.035 consumption and pergram = CNY 1.12 per gram = CNY 3.04 cost Name of Polyformaldehyde (POM)low-density material Material 19 grams × CNY 0.025 consumption and pergram = CNY 0.48 cost Cutting tool CNY 1.13 CNY 2.24 consumptionMachining time 212 second × CNY 0.011 381 second × CNY 0.011 Machiningand cost per second = CNY 2.33 per second = CNY 4.19 time is saved by26% Total cost CNY 5.6 CNY 9.4 Total cost is save by 39% Soundconducting Sound source: 114 dB Sound source: 114 dB Sound performancetest 1000 HZ 1000 HZ conducting (where a sound is Measured value: 110 dBMeasured value: 109.5 dB performance collected by a Sound source: 114 dBSound source: 114 dB 500 HZ has no sound collecting 500 HZ Measuredvalue: 102.3 dB significant chamber of the Measured value: 101 dB changestethoscope) External noise Sound source: 114 dB Sound source: 114 dBExternal resistance 1000 HZ 1000 HZ noise performance test Measuredvalue: 31.3 dB Measured value: 39.8 dB resistance is (where a sound isSound source: 114 dB 500 HZ Sound source: 114 dB improved by collectedby a back Measured value: 26.7 dB 500 HZ 21% to 28% of the stethoscope)Measured value: 36.9 dB Aesthetics (two With two colors mixed MonochromeVisual effect colors mixed) is improved Portability 51 grams 87 gramsEasy to carry (in weight)

Comparative data of a stethoscope of the second embodiment of thepresent disclosure with the KS-450B type of stethoscope are shown below.

Type of stethoscope Data with single sound comparison collecting surfaceThe inventive stethoscope KS-450B result Structure Integratedcombination of Made of only high density high density material andmaterial low density material formed by injection molding Name of highStainless steel (type 304) Stainless steel(type 304) density materialMaterial 37 grams × CNY 0.035 90 grams × CNY 0.035 consumption and pergram = CNY 1.29 per gram = CNY 3.15 cost Name of Polyformaldehyde (POM)low-density material Material 17 grams × CNY 0.025 consumption and pergram = CNY 0.42 cost Cutting tool CNY 1.23 CNY 2.30 consumptionMachining time 225 sec × CNY 0.011 390 sec × CNY 0.011 Machining andcost per sec = CNY 2.47 per sec = CNY 4.29 time is saved by 43 Totalcost CNY 5.41 CNY 9.74 Total cost is save by 45 Sound conducting Soundsource: 114 dB Sound source: 114 dB Sound performance test 1000 HZ 1000HZ conducting (where a sound is Measured value: 111 dB Measured value:108.5 dB performance collected by a Sound source: 114 dB Sound source:114 dB has no sound collecting 500 HZ 500 HZ significant chamber of theMeasured value: 103 dB Measured value: 101.6 dB change stethoscope)External noise Sound source: 114 dB Sound source: 114 dB Externalresistance 1000 HZ 1000 HZ noise performance test Measured value: 32.2dB Measured value: 38.1 dB resistance is (where a sound is Sound source:114 dB Sound source: 114 dB improved by collected by a back 500 HZ 500HZ 16% to 22% of the stethoscope) Measured value: 29 dB Measured value:37 dB Aesthetics (two With two colors mixed Monochrome Visual effectcolors mixed) is improved Portability 53 grams 88 grams Easy to carry(in weight)

Comparative data of a stethoscope of the second embodiment of thepresent disclosure with the KS-450C type of stethoscope are shown below.

Type of stethoscope Data with single sound comparison collecting surfaceThe inventive stethoscope KS-450C result Structure Integratedcombination of Made of only high density high density material andmaterial low density material formed by injection molding Name of highStainless steel (type 304) Stainless steel(type 304) density materialMaterial 33 grams × CNY 0.035 85 grams × CNY 0.035 consumption and pergram = CNY 1.15 per gram = CNY 2.97 cost Name of Polyformaldehyde (POM)low-density material Material 21 grams × CNY 0.025 consumption and pergram = CNY 0.52 cost Cutting tool CNY 1.07 CNY 2.5 consumption Machiningtime 234 sec × CNY 0.011 395 sec × CNY 0.011 Machining and cost persecond = CNY 2.57 per second = CNY 4.34 time is saved by 41 Total costCNY 5.31 CNY 9.81 Total cost is save by 46 Sound conducting Soundsource: 114 dB Sound source: 114 dB Sound performance test 1000 HZ 1000HZ conducting (where a sound is Measured value: 108.2 dB Measured value:106 dB performance collected by a Sound source: 114 dB Sound source: 114dB has no sound collecting 500 HZ 500 HZ significant chamber of theMeasured value: 109.1 dB Measured value: 105.2 dB change stethoscope)External noise Sound source: 114 dB Sound source: 114 dB Externalresistance 1000 HZ 1000 HZ noise performance test Measured value: 33.6dB Measured value: 41.1 dB resistance is (where a sound is Sound source:114 dB Sound source: 114 dB improved by collected by a back 500 HZ 500HZ 19% to 27% of the stethoscope) Measured value: 28.2 dB Measuredvalue: 38.4 dB Aesthetics (two With two colors mixed Monochrome Visualeffect colors mixed) is improved Portability 55 grams 84 grams Easy tocarry (in weight)

Comparing Example 3

a stethoscope of the third embodiment of the present invention (where anupper head body is made of a high density material, a lower head body ismade of a combination of a high density material and a low densitymaterial) is compared with stethoscopes of KS-500A, KS-500B and KS-500Ctypes manufactured by Wuxi Kaishun Medical Device Manufacturing CO.,Ltd.

Comparative data of a stethoscope of the third embodiment of the presentdisclosure with the KS-500A type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-500A result Structure Upper head body ismade of Made of only high density only high density material, a materiallower head body is made of combination of high density material and lowdensity material Name of high Stainless steel (type 304) Stainlesssteel(type 304) density material Material 55 grams × CNY 0.035 98 grams× CNY 0.035 consumption and per gram = CNY 1.93 per gram = CNY 3.43 costName of Polyformaldehyde (POM) low-density material Material 12 grams ×CNY 0.025 consumption and per gram = 0.3 cost Cutting tool 2.32 2.74consumption Machining time 315 second × CNY 0.011 453 second × CNY 0.011Machining and cost per second = CNY 3.47 per second = CNY 4.98 time issaved by 31% Total cost CNY 8.02 CNY 11.15 Total cost is save by 28%Sound conducting Sound source: 114 dB Sound source: 114 dB Soundperformance test 1000 HZ 1000 HZ conducting (where a sound is Measuredvalue: 113 dB Measured value: 112.7 dB performance collected by a Soundsource: 113 dB Sound source: 114 dB 500 HZ has no sound collecting 500HZ Measured value: 102.5 dB significant chamber of the Measured value:103 dB change stethoscope) External noise Sound source: 114 dB Soundsource: 114 dB External resistance 1000 HZ 1000 HZ noise performancetest Measured value: 32.5 dB Measured value: 41.4 dB resistance is(where a sound is Sound source: 114 dB 500 HZ Sound source: 114 dBimproved by collected by a back Measured value: 25.1 dB 500 HZ 20% ofthe stethoscope) Measured value: 34.8 dB Aesthetics (two With two colorsmixed Monochrome Visual effect colors mixed) is improved Portability 67grams 98 grams Easy to carry (in weight)

Comparative data of a stethoscope of the third embodiment of the presentdisclosure with the KS-500B type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-500B result Structure Upper head body ismade of Made of only high density only high density material, materiallower head body is made of combination of high density material and lowdensity material Name of high Stainless steel (type 304) Stainlesssteel(type 304) density material Material 53 grams × CNY 0.035 96 grams× CNY 0.035 consumption and per gram = CNY 1.85 per gram = CNY 3.36 costName of Polyformaldehyde (POM) low-density material Material 11 grams ×CNY 0.025 consumption and per gram = CNY 0.27 cost Cutting tool 2.222.61 consumption Machining time 327 second × CNY 0.011 466 second × CNY0.011 Machining and cost per second = CNY 3.59 per second = CNY 5.12time is saved by 30% Total cost CNY 7.93 CNY 11.09 Total cost is save by29% Sound conducting Sound source: 114 dB Sound source: 114 dB Soundperformance test 1000 HZ 1000 HZ conducting (where a sound is Measuredvalue: 122.3 dB Measured value: 113.4 dB performance collected by aSound source: 113 dB Sound source: 114 dB 500 HZ has no sound collecting500 HZ Measured value: 106.6 dB significant chamber of the Measuredvalue: 110.2 dB change stethoscope) External noise Sound source: 114 dBSound source: 114 dB External resistance 1000 HZ 1000 HZ noiseperformance test Measured value: 35.1 dB Measured value: 43.2 dBresistance is (where a sound is Sound source: 114 dB 500 HZ Soundsource: 114 dB improved by collected by a back Measured value: 27.5 dB500 HZ 19% to 27% of the stethoscope) Measured value: 37.4 dB Aesthetics(two With two colors mixed Monochrome Visual effect colors mixed) isimproved Portability 69 grams 100 grams Easy to carry (in weight)

Comparative data of a stethoscope of the third embodiment of the presentdisclosure with the KS-500C type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-500C result Structure Upper head body ismade of Made of only high density only high density material, materiallower head body is made of combination of high density material and lowdensity material Name of high Stainless steel (type 304) Stainlesssteel(type 304) density material Material 57 grams × CNY 0.035 100 grams× CNY 0.035 consumption and per gram = CNY 1.99 per gram = CNY 3.5 costName of Polyformaldehyde (POM) low-density material Material 15 grams ×CNY 0.025 consumption and per gram = CNY 0.37 cost Cutting tool CNY 2.5CNY 2.88 consumption Machining time 332 second × CNY 0.011 477 second ×CNY 0.011 Machining and cost per second = CNY 3.65 per second = CNY 5.24time is saved by 31% Total cost CNY 8.51 CNY 11.62 Total cost is save by27% Sound conducting Sound source: 114 dB Sound source: 114 dB Soundperformance test 1000 HZ 1000 HZ conducting (where a sound is Measuredvalue: 131.2 dB Measured value: 120.4 dB performance collected by aSound source: 114 dB Sound source: 114 dB 500 HZ has no sound collecting500 HZ Measured value: 108.8 dB significant chamber of the Measuredvalue: 105.5 dB change stethoscope) External noise Sound source: 114 dBSound source: 114 dB External resistance 1000 HZ 1000 HZ noiseperformance test Measured value: 34.5 dB Measured value:41.4 dBresistance is (where a sound is Sound source: 114 dB 500 HZ Soundsource: 114 dB improved by collected by a back Measured value: 25.1 dB500 HZ 17% to 28% of the stethoscope) Measured value: 34.8 dB Aesthetics(two With two colors mixed Monochrome Visual effect colors mixed) isimproved Portability 75 grams 102 grams Easy to carry (in weight)

it can be known from the above comparative data that in the presentdisclosure, a time for manufacturing the inventive stethoscope is savedby about 30%, a cost for manufacturing the inventive stethoscope isreduced by about 30%, the external noise resistance of the inventivestethoscope is improved by about 20%, a weight of the inventivestethoscope is reduced by about 30%, without significant change to thesound conducting performance, and the stethoscope is easy to carry andhas a good appearance.

Comparing Example 4

a stethoscope of the forth embodiment of the present invention (where anupper head body is made of a combination of a high density material anda low density material, a lower head body is made of only a high densitymaterial) is compared with stethoscopes of KS-510A, KS-510B and KS-510Ctypes manufactured by Wuxi Kaishun Medical Device Manufacturing CO.,Ltd.

Comparative data of a stethoscope of the forth embodiment of the presentdisclosure with the KS-510A type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-510A result Structure Upper head body ismade of Made of only high density a combination of high material densitymaterial and low density material, lower head body is made of only highdensity material Name of high Stainless steel (type 304) Stainlesssteel(type 304) density material Material 65 grams × CNY 0.035 98 grams× CNY 0.035 consumption and per gram = CNY 2.27 per gram = CNY 3.43 costName of Polyformaldehyde (POM) low-density material Material 9 grams ×CNY 0.025 consumption and per gram = CNY 0.26 cost Cutting tool 2.132.72 consumption Machining time 306 second × CNY 0.011 437 second × CNY0.011 Machining and cost per second = CNY 3.47 per second = CNY 4.98time is saved by 30% Total cost CNY 8.13 CNY 11.15 Total cost is save by27% Sound conducting Sound source: 114 dB Sound source: 114 dB Soundperformance test 1000 HZ 1000 HZ conducting (where a sound is Measuredvalue: 113.7 dB Measured value: 113.1 dB performance collected by aSound source: 114 dB 500 HZ Sound source: 114 dB 500 HZ has no soundcollecting Measured value: 101.9 dB Measured value: 102.4 dB significantchamber of the change stethoscope) External noise Sound source: 114 dBSound source: 114 dB External resistance 1000 HZ 1000 HZ noiseperformance test Measured value: 32.7 dB Measured value: 41.8 dBresistance is (where a sound is Sound source: 114 dB 500 HZ Soundsource: 114 dB improved by collected by a back Measured value: 25.7 dB500 HZ 20% of the stethoscope) Measured value: 34.5 dB Aesthetics (twoWith two colors mixed Monochrome Visual effect colors mixed) is improvedPortability 74 grams 98 grams Easy to carry (in weight)

Comparative data of a stethoscope of the forth embodiment of the presentdisclosure with the KS-510B type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-510A result Structure Upper head body ismade of Made of only high density a combination of high material densitymaterial and low density material, lower head body is made of only highdensity material Name of high Stainless steel (type 304) Stainlesssteel(type 304) density material Material 68 grams × CNY 0.035 100 grams× CNY 0.035 consumption and per gram = CNY 2.38 per gram = CNY 3.5 costName of Polyformaldehyde (POM) low-density material Material 9.8 grams ×CNY 0.025 consumption and per gram = CNY 0.24 cost Cutting tool CNY 2.47CNY 2.89 consumption Machining time 321 second × CNY 0.011 448 second ×CNY 0.011 Machining and cost per second = CNY 3.53 per second = CNY 4.92time is saved by 29% Total cost CNY 8.62 CNY 11.31 Total cost is save by24% Sound conducting Sound source: 114 dB Sound source: 114 dB Soundperformance test 1000 HZ 1000 HZ conducting (where a sound is Measuredvalue: 121.4 dB Measured value: 118.7 dB performance collected by aSound source: 114 dB 500 HZ Sound source: 114 dB 500 HZ has no soundcollecting Measured value: 102.4 dB Measured value: 110.3 dB significantchamber of the change stethoscope) External noise Sound source: 114 dBSound source: 114 dB External resistance 1000 HZ 1000 HZ noiseperformance test Measured value: 33.5 dB Measured value: 45 dBresistance is (where a sound is Sound source: 114 dB 500 HZ Soundsource: 114 dB improved by collected by a back Measured value: 28.1 dB500 HZ 26% of the stethoscope) Measured value: 37.6 dB Aesthetics (twoWith two colors mixed Monochrome Visual effect colors mixed) is improvedPortability 77 grams 101 grams Easy to carry (in weight)

Comparative data of a stethoscope of the forth embodiment of the presentdisclosure with the KS-510C type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-510C result Structure Upper head body ismade of Made of only high density a combination of high material densitymaterial and low density material, lower head body is made of only highdensity material Name of high Stainless steel (type 304) Stainlesssteel(type 304) density material Material 66.2 grams × CNY 0.035 102.2grams × CNY 0.035 consumption and per gram = CNY 2.31 per gram = CNY3.57 cost Name of Polyformaldehyde (POM) low-density material Material8.7 grams × CNY 0.025 consumption and per gram = CNY 0.21 cost Cuttingtool CNY 2.04 CNY 2.67 consumption Machining time 324 second × CNY 0.011455 second × CNY 0.011 Machining and cost per second = CNY 3.56 persecond = CNY 5 time is saved by 29% Total cost CNY 8.12 CNY 11.24 Totalcost is save by 28% Sound conducting Sound source: 114 dB Sound source:114 dB Sound performance test 1000 HZ 1000 HZ conducting (where a soundis Measured value: 125.1 dB Measured value: 116.4 dB performancecollected by a Sound source: 114 dB 500 HZ Sound source: 114 dB 500 HZhas no sound collecting Measured value: 104.2 dB Measured value: 11.2 dBsignificant chamber of the change stethoscope) External noise Soundsource: 114 dB Sound source: 114 dB External resistance 1000 HZ 1000 HZnoise performance test Measured value: 33.2 dB Measured value: 45 dBresistance is (where a sound is Sound source: 114 dB 500 HZ Soundsource: 114 dB improved by collected by a back Measured value: 27.9 dB500 HZ 26% to 27% of the stethoscope) Measured value: 37.3 dB Aesthetics(two With two colors mixed Monochrome Visual effect colors mixed) isimproved Portability 79 grams 96 grams Easy to carry (in weight)

It can be known from the above comparative data that time formanufacturing the inventive stethoscope is saved by 30%, a cost formanufacturing the inventive stethoscope is reduced by about 30%, theexternal noise resistance of the inventive stethoscope is improved byabout 20%, a weight of the inventive stethoscope is reduced by about onethird, without significant change to the sound conducting performance,and the stethoscope is easy to carry and has a good appearance.

Comparing Example 5

a stethoscope of the fifth embodiment of the present invention (whereboth of an upper head body and a lower head body are made of acombination of a high density material and a low density material) iscompared with stethoscopes of KS-520A, KS-520B and KS-520C typesmanufactured by Wuxi Kaishun Medical Device Manufacturing CO., Ltd.

Comparative data of a stethoscope of the fifth embodiment of the presentdisclosure with the KS-520A type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-520A result Structure Both of an upper headbody Made of only high density and a lower head body are material madeof a combination of high density material and low density material Nameof high Stainless steel (type 304) Stainless steel(type 304) densitymaterial Material 32 grams × CNY 0.035 101 grams × CNY 0.035 consumptionand per gram = CNY 1.12 per gram = CNY 3.53 cost Name ofPolyformaldehyde (POM) low-density material Material 21 grams × CNY0.025 consumption and per gram = CNY 0.52 cost Cutting tool CNY 2.27 CNY2.85 consumption Machining time 287 seondc × CNY 0.011 396 second × CNY0.011 Machining and cost per second = CNY 3.16 per second = CNY 4.36time is saved by 28% Total cost CNY 7.07 CNY 10.74 Total cost is save by33% Sound conducting Sound source: 114 dB Sound source: 114 dB Soundperformance test 1000 HZ 1000 HZ conducting (where a sound is Measuredvalue 113.5 dB Measured value 112.3 dB performance collected by a Soundsource: 114 dB 500 HZ Sound source: 114 dB 500 HZ has no soundcollecting Measured value: 103.3 dB Measured value: 102.1 dB significantchamber of the change stethoscope) External noise Sound source: 114 dBSound source: 114 dB External resistance 1000 HZ 1000 HZ noiseperformance test Measured value 32.7 dB Measured value 41.9 dBresistance is (where a sound is Sound source: 114 dB 500HZ Sound source:114 dB improved by collected by a back Measured value: 25.7 dB 500 HZ20% of the stethoscope) Measured value: 34.1 dB Aesthetics (two With twocolors mixed Monochrome Visual effect colors mixed) is improvedPortability 53 grams 98 grams Easy to carry (in weight)

Comparative data of a stethoscope of the fifth embodiment of the presentdisclosure with the KS-520B type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-520B result Structure Both of an upper headbody Made of only high density and a lower head body are material madeof a combination of high density material and low density material Nameof high Stainless steel (type 304) Stainless steel(type 304) densitymaterial Material 33.3 grams × CNY 0.035 103 grams × CNY 0.035consumption and per gram = CNY 1.16 per gram = CNY 3.6 cost Name ofPolyformaldehyde (POM) low-density material Material 23.5 grams × CNY0.025 consumption and per gram = CNY 0.58 cost Cutting tool CNY 2.33 CNY2.94 consumption Machining time 276 second × CNY 0.011 401 second × CNY0.011 Machining and cost per second = CNY 3.03 per second = CNY 4.41time is saved by 32% Total cost CNY 7.1 CNY 10.95 Total cost is save by36% Sound conducting Sound source: 114 dB Sound source: 114 dB Soundperformance test 1000 HZ 1000 HZ conducting (where a sound is Measuredvalue 115.7 dB Measured value 112.3 dB performance collected by a Soundsource: 114 dB 500 HZ Sound source: 114 dB 500 HZ has no soundcollecting Measured value: 108.3 dB Measured value: 104.4 dB significantchamber of the change stethoscope) External noise Sound source: 114 dBSound source: 114 dB External resistance 1000 HZ 1000 HZ noiseperformance test Measured value: 33.1 dB Measured value: 43.6 dBresistance is (where a sound is Sound source: 114 dB 500 HZ Soundsource: 114 dB improved by collected by a back Measured value: 27.4 dB500 HZ 24% to 25% of the stethoscope) Measured value: 35.9 dB Aesthetics(two With two colors mixed Monochrome Visual effect colors mixed) isimproved Portability 56 grams 108 grams Easy to carry (in weight)

Comparative data of a stethoscope of the fifth embodiment of the presentdisclosure with the KS-520C type of stethoscope are shown below.

Type of stethoscope Data with two sound comparison collecting surfacesThe inventive stethoscope KS-520C result Structure Both of an upper headbody Made of only high density and a lower head body are material madeof a combination of high density material and low density material Nameof high Stainless steel (type 304) Stainless steel(type 304) densitymaterial Material 31.5 grams × CNY 0.035 106 grams × CNY 0.035consumption and per gram = CNY 1.1 per gram = CNY 3.71 cost Name ofPolyformaldehyde (POM) low-density material Material 22.5 grams × CNY0.025 consumption and per gram = CNY 0.56 cost Cutting tool CNY 2.5 CNY2.96 consumption Machining time 290 second × CNY 0.011 388 second × CNY0.011 Machining and cost per second = CNY 3.19 per second = CNY 4.26time is saved by 26% Total cost CNY 7.35 CNY 10.93 Total cost is save by33% Sound conducting Sound source: 114 dB Sound source: 114 dB Soundperformance test 1000 HZ 1000 HZ conducting (where a sound is Measuredvalue: 120.3 dB Measured value: 125 dB performance collected by a Soundsource: 114 dB 500 HZ Sound source: 114 dB 500 HZ has no soundcollecting Measured value: 111 dB Measured value: 108.6 dB significantchamber of the change stethoscope) External noise Sound source: 114 dBSound source: 114 dB External resistance 1000 HZ 1000 HZ noiseperformance test Measured value: 31.4 dB Measured value: 43.3 dBresistance is (where a sound is Sound source: 114 dB 500 HZ Soundsource: 114 dB improved by collected by a back Measured value: 28.5 dB500 HZ 25% to 28% of the stethoscope) Measured value: 37.8 dB Aesthetics(two With two colors mixed Monochrome Visual effect colors mixed) isimproved Portability 50 grams 92 grams Easy to carry (in weight)

It can be known from the above comparative data that time formanufacturing the inventive stethoscope is saved by about 30%, a costfor manufacturing the inventive stethoscope is reduced by about 30%, theexternal noise resistance of the inventive stethoscope is improved byabout 20%, a weight of the inventive stethoscope is reduced by about onethird, without significant change to the sound conducting performance,and the stethoscope is easy to carry and has a good appearance.

1. A stethoscope head, comprising a head body and a sound guidingconduit formed in the head body, the sound guiding conduit comprising asound collecting surface, a sound guiding pore and a lateral soundguiding aperture, the sound collecting surface, the sound guiding poreand the lateral sound guiding aperture being located at the head bodyand intercommunicated with each other, wherein, at least a portion ofthe head body is made of material of a second density, and a density ofa sound guiding layer on the sound collecting surface is larger than thesecond density.
 2. The stethoscope head of claim 1, wherein, a densityof a sound guiding layer in the sound guiding pore is larger than thesecond density, and the density of the sound guiding layer in the soundguiding pore is the same as or different from the density of the soundguiding layer on the sound collecting surface.
 3. The stethoscope headof claim 1, wherein, the head body is assembled and comprises an upperhead body and a lower head body which match with each other, the soundcollecting surface comprises an upper sound collecting surface disposedon the upper head body and a lower sound collecting surface disposed onthe lower head body, the upper sound collecting surface is communicatedwith the lower sound collecting surface through the sound guiding pore,the sound guiding pore is communicated with lateral sound guidingaperture, the lower head body is made of the same material as ordifferent material from that of the upper head body, and at least one ofthe lower head body and the upper head body is made of the material ofthe second density.
 4. The stethoscope head of claim 3, wherein, theupper head body is made of material of a first density, the lower headbody is made of the material of the second density, and the firstdensity is larger than the second density.
 5. The stethoscope head ofclaim 3, wherein, the lower head body is made of material of a firstdensity, the upper head body is made of the material of the seconddensity, and the first density is larger than the second density.
 6. Thestethoscope head of claim 3, wherein, both of the lower head body andthe upper head body are made of the material of the second density. 7.The stethoscope head of claim 1, wherein, the head body is integratedand made of the material of the second density, the density of thematerial of the sound guiding layer is larger than the second density,and the head body is provided with at least single sound collectingsurface.
 8. A method for reducing a weight of a stethoscope head,wherein the stethoscope head comprises a head body and a sound guidingconduit formed in the head body, the sound guiding conduit comprises asound collecting surface, a sound guiding pore and a lateral soundguiding aperture, and the sound collecting surface, the sound guidingpore and the lateral sound guiding aperture are located at the headbody, wherein the method comprises: providing material of a firstdensity, at least a sound guiding layer on the sound collecting surfaceis made of the material of the first density so as to ensure soundconducting quality of the stethoscope head; providing material of asecond density, at least a portion of the stethoscope head is made ofthe material of the second density, wherein the second density is lessthan the first density.
 9. The method of claim 8, wherein, a soundguiding layer in the sound guiding pore is made of material of a thirddensity, the second density is less than the third density, and thethird density is the same as or different from the first density. 10.The stethoscope head of claim 2, wherein, the head body is assembled andcomprises an upper head body and a lower head body which match with eachother, the sound collecting surface comprises an upper sound collectingsurface disposed on the upper head body and a lower sound collectingsurface disposed on the lower head body, the upper sound collectingsurface is communicated with the lower sound collecting surface throughthe sound guiding pore, the sound guiding pore is communicated withlateral sound guiding aperture, the lower head body is made of the samematerial as or different material from that of the upper head body, andat least one of the lower head body and the upper head body is made ofthe material of the second density.
 11. The stethoscope head of claim 2,wherein, the head body is integrated and made of the material of thesecond density, the density of the material of the sound guiding layeris larger than the second density, and the head body is provided with atleast single sound collecting surface.